CN110701073A

CN110701073A - Fan system, control method and range hood applying fan system

Info

Publication number: CN110701073A
Application number: CN201910964509.0A
Authority: CN
Inventors: 张青青; 翁建松; 陈旭斌
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2019-10-11
Filing date: 2019-10-11
Publication date: 2020-01-17

Abstract

The invention discloses a fan system, which comprises a volute and an impeller arranged in the volute, wherein a volute tongue is formed on the volute, an interval of 0 degrees to 60 degrees where the volute tongue is located is defined as a fixed area along the direction from a starting point to a terminal point of a molded line of the volute, the impeller comprises at least two blades which are circumferentially arranged at intervals, each blade comprises a blade body and an elastic material layer coated on the periphery of the blade body, the fan system further comprises an adjusting device, and the adjusting device comprises an inflation tank and an inflation control unit, wherein the inflation control unit is communicated with the elastic material layer, and the inflation control unit is used for controlling the inflation tank. Also discloses a control method of the fan system and a range hood applying the fan system. Compared with the prior art, the invention has the advantages that: the airflow supplement of the volute tongue 'fixing area' is carried out by utilizing an inflation mode, so that on one hand, the airflow state in the fan system tends to be stable, and the effective air quantity is ensured; on the other hand, the structural rigidity of the impeller is adjusted in real time, so that abnormal sound is improved.

Description

Fan system, control method and range hood applying fan system

Technical Field

The invention relates to a power device, in particular to a fan system, a control method of the fan system and a range hood applying the fan system.

Background

The range hood works by utilizing the fluid dynamics principle, sucks and exhausts oil smoke through a centrifugal fan arranged in the range hood, and filters partial grease particles by using a filter screen. The centrifugal fan comprises a volute, an impeller arranged in the volute and a motor driving the impeller to rotate. When the impeller rotates, negative pressure suction is generated in the center of the fan, oil smoke below the range hood is sucked into the fan, accelerated by the fan and then collected and guided by the volute to be discharged out of a room.

The main noise source of the range hood is a fan system, and the conditions of the use environment of a user, a smoke exhaust channel of a user home and the like are completely different, so that the backpressure in an air outlet pipe of the range hood is different during a cooking peak period, and the airflow in a volute is further influenced. In addition, the volute tongue is used as a main part for noise reduction, is a key part for connecting the air outlet cover and the smoke exhaust pipeline, is influenced by inertia of instantaneous opening and closing of the smoke exhaust pipeline at the range hood and factors such as kitchen environment airflow of a user during cooking, and the like, and airflow leakage can occur to cause unstable airflow in a fan system and abnormal noise.

There are some fan systems for improving noise performance, such as an impeller disclosed in application No. 201510648255.3, which includes a disk and blades, wherein at least one of the blades is a flexible blade, and the flexible blade is fixed to the disk only at an inner peripheral end thereof close to a center of the disk and at an outer peripheral end thereof far from the center of the disk. By designing at least one of the blades as a flexible blade, and fixing the flexible blade to the disk only at its inner and outer peripheral ends, the portion of the flexible blade, which is located between the inner circumferential end and the outer circumferential end thereof, is not fixed, the portion of the flexible blade, which is not fixed, can be automatically deformed as the load is changed, and is adjusted to the position suitable for the corresponding working condition under the action of the lifting drag force, the utilization rate of the flexible blades is higher, the average utilization rate of the blades in the impeller is improved, thereby improving the running efficiency of the whole impeller and the efficiency of the whole fan, simultaneously, the unfixed part of the flexible blade can automatically deform along with the change of the load and is adjusted to the position adapting to the corresponding working condition under the action of the lifting drag force, the flow performance of the flexible blade can be effectively improved, the conversion efficiency is improved, the energy dissipated by the fan in the aspects of friction, leakage and the like is attenuated, and the noise performance is also better improved.

The prior art aims at the problem that abnormal sound is caused by the change of parameters such as structural rigidity change caused by the influence of the impeller on installation and transportation and the airflow of a fan system, so that the aim of stabilizing the airflow of the fan system is fulfilled by taking the impeller as a carrier and regulating the partition and the flexible structure of the impeller.

In fact, the volute is approximately regarded as a circular structure, the range of main airflow influence is the 60-degree range (defined as a "fixed zone") of the volute tongue, and when the impeller rotates to the "fixed zone", the blades correspondingly covered in the "fixed zone" are impacted by rapid airflow in the rotating process of the impeller, so that the rigidity of the blades is changed, airflow leaks, and squeal and other similar abnormal sounds are generated. The above prior art does not solve this problem, and needs further improvement.

Disclosure of Invention

The first technical problem to be solved by the present invention is to provide a blower system, which can ensure effective air volume and improve abnormal sound, in view of the above-mentioned deficiencies in the prior art.

The second technical problem to be solved by the present invention is to provide a control method for the above fan system.

The third technical problem to be solved by the invention is to provide a range hood with the fan system.

The technical scheme adopted by the invention for solving the first technical problem is as follows: a fan system comprises a volute, an impeller arranged in the volute and a motor used for driving the impeller, wherein the volute is provided with a volute tongue, and the fan system is characterized in that: the fan system comprises a volute, a blade wheel, an impeller, a fan blade and an adjusting device, wherein the volute is arranged on the blade wheel, the impeller comprises at least two blades which are circumferentially arranged at intervals, each blade comprises a blade body and an elastic material layer which is coated on the periphery of the blade body, the adjusting device comprises an inflation tank which is communicated with the elastic material layer, and an inflation control unit which is used for controlling the inflation tank to inflate the blades passing through the fixing area.

In order to detect the displacement value of the blade and judge whether the rigidity needs to be changed by inflation, the adjusting device further comprises a first micro laser displacement sensor arranged at the starting point of the fixed area and the inner side of the volute and a second micro laser displacement sensor arranged at the stopping point of the fixed area and the inner side of the volute.

In order to control the starting of the two micro laser displacement sensors, the adjusting device further comprises a driving controller which is arranged on the outer side wall of the volute and used for controlling the first micro laser displacement sensor and the second micro laser displacement sensor.

In order to facilitate the determination of the inflation quantity and the discharge of faults, the volute is also provided with an air outlet, and the adjusting device further comprises an air pressure detection sensor arranged at the air outlet in the volute and a rotating speed detection sensor arranged on the impeller.

In order to control the driving controller conveniently, the air inflation amount is set according to air pressure and rotating speed, the adjusting device further comprises a region controller arranged in the volute and a timer electrically connected with the region controller, the air pressure detection sensor, the rotating speed detection sensor, the air inflation control unit and the driving controller are all electrically connected with the region controller, the first micro laser displacement sensor and the second micro laser displacement sensor are all electrically connected with the driving controller, and the air inflation control unit is in wireless connection with the region controller.

The technical scheme adopted by the invention for solving the second technical problem is as follows: a control method of the fan system comprises the following steps:

1) starting a fan system;

2) after the fan system is started for a certain time, the drive controller controls the first micro laser displacement sensor to start detection, obtains a current operation displacement value d1 of the blade, and transmits the current operation displacement value d1 to the zone controller; the air pressure detection sensor synchronously starts a detection air pressure value after the fan system is started to obtain an air pressure value P1 of a current corresponding position, and the air pressure value P1 is transmitted to the zone controller; after the fan system is started for a certain time, the rotating speed detection sensor starts to detect the rotating speed, so that a rotating speed value R1 of the current operation of the impeller is obtained and is transmitted to the region controller;

3) the zone controller judges whether the received d1 is equal to a preset X1, if so, the step 4) is carried out, and if not, the step 2) is carried out again to detect the current operation displacement value d 1;

4) the zone controller marks the detected blade as an original point and starts a timer;

5) the zone controller calls a current rotating speed value R1 and an air pressure value P1;

6) the zone controller judges whether R1 is greater than a preset highest rotating speed or not and whether P1 is greater than a preset maximum pressure or not, if yes, whether an air pipeline is abnormal or not and whether a motor is overloaded or not are detected, and if not, the step 7 is carried out);

7) the zone controller obtains the time t when the original point reaches the second micro laser displacement sensor at the current rotating speed; meanwhile, the region controller gives out the amount Q1 to be inflated according to the current rotating speed value R1 and the air pressure value P1 and transmits the amount Q1 to the inflation control unit;

8) the area controller transmits the value t to the driving controller, and the driving controller controls the second micro laser displacement sensor to start detection after t to obtain a current displacement value d2 when the original point rotates to a corresponding detection position; meanwhile, in the rotation process of the impeller, starting from an original point marked by the area controller, sequentially charging the blades with a to-be-charged gas Q1 by the charging tank along the rotation direction of the impeller;

9) the zone controller judges whether the received d2 is equal to the preset X2, if so, the step 10) is carried out, and if not, the step 7) is carried out;

10) completing inflation; return to step 2).

The technical scheme adopted by the invention for solving the third technical problem is as follows: a range hood, its characterized in that: a fan system as described above is applied.

Compared with the prior art, the invention has the advantages that: considering that the special structure of the volute tongue part causes airflow leakage, the inflatable blades are arranged, and the airflow supplement of the volute tongue 'fixing area' is carried out in an inflation mode, so that on one hand, the airflow state in the fan system tends to be stable, and the effective air quantity is ensured; on the other hand, the structural rigidity of the impeller is adjusted in real time, so that abnormal sound is improved.

Drawings

FIG. 1 is a schematic view of a fan system according to an embodiment of the present disclosure;

FIG. 2 is a cross-sectional view of a hidden impeller of a fan system according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a blade of an impeller of a fan system of an embodiment of the present invention;

FIG. 4 is a schematic profile view of a volute of a blower system according to an embodiment of the present invention;

FIG. 5 is a functional block diagram of an adjustment device according to an embodiment of the present invention;

fig. 6 is a control flowchart of the fan system according to the embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Referring to fig. 1, a fan system is a centrifugal fan and is mainly used for a range hood. Comprises a volute 1, an impeller 2 arranged in the volute 1 and a motor 3 for driving the impeller 2 to rotate. The volute 1 comprises an annular wall 11 on which a volute tongue 12 is formed. In the whole fan system, the unstable area of the airflow is the area corresponding to the volute tongue, and the effective air quantity of the range hood can be greatly improved and abnormal sound can be effectively eliminated as long as the airflow in the area near the volute tongue is controlled to be stable.

Referring to fig. 4, the profile of the volute 1 is approximately seen as a circle, the position of the volute tongue 12 (the center of the volute tongue) is 0 °, and the region from the starting point to the end point of the profile to 60 ° is defined as a fixed area 13, which is the main area of influence of the airflow.

In order to reduce the influence of airflow, ensure effective air quantity and improve abnormal sound, the fan also comprises a regulating device. The adjustment means comprise a first micro-laser displacement sensor 41 arranged at the beginning of the fixation area 13 inside the circumferential wall 11 and a second micro-laser displacement sensor 42 arranged at the end of the fixation area 13 inside the circumferential wall 11. After the blower 3 is turned on for a certain time, for example, 30s, the first micro laser displacement sensor 41 and the second micro laser displacement sensor 42 start to operate, when the impeller 2 rotates to the starting point of the fixed area 13, the first micro laser displacement sensor 41 obtains a displacement value X1, and when the impeller 2 rotates to the stop position of the fixed area 13, the micro laser displacement sensor 42 obtains a second displacement value X2.

The positions of the first micro laser displacement sensor 41 and the second micro laser displacement sensor 42 do not need to be specified in the axial direction of the scroll casing 1, and the above conditions are satisfied only in the circumferential direction.

The impeller 2 comprises at least two circumferentially spaced blade bodies 211, each blade body 211 being surface coated with a layer 212 of deformable elastomeric material, see fig. 3. The adjusting device further comprises an inflation control unit 43 and an inflation tank 44, wherein the inflation control unit 43 is arranged on the outer side wall of the volute 1, the inflation tank 44 is arranged outside the volute 1, and the inflation control unit 43 is used for controlling the opening or closing of the inflation tank 44 and the inflation flow of the inflation tank 44. The surface of the elastomeric layer 212 is perforated to communicate with the inflator 44 so that the bladder 44 can inflate the blades 21 to change their stiffness. Alternatively, the inflation connection, such as the inflation tank 44, is located close to the disk of the impeller 2, and the inflation can be accomplished by bending the fixed portion of the disk while the blades 21 are rotating. Each vane 21 may also be in communication with the inflator 44 separately. The above-mentioned elastic material layer 212, the aeration control unit 43 and the aeration tank 44 constitute a rigidity adaptive adjustment module of the blades 21 of the impeller 2.

The volute 1 is further formed with an air outlet 14, the adjusting device further comprises an air pressure detection sensor 45 arranged at the air outlet 14 in the volute 1, a zone controller 46 and a timer 47 in the volute 1, the zone controller 46 and the timer 47 can be arranged in the fixed zone 13, and the timer 47 is directly electrically connected with the zone controller 46. The air pressure detection sensor 45 and the inflation control unit 43 are electrically connected to a zone controller 46. When the air pressure detection sensor 45 detects the current air pressure, the current pressure value is acquired and sent to the area controller 46, and the area controller 46 feeds back the acquired value to the inflation control unit 43, thereby controlling the flow rate of the inflation tank 44.

By setting the timer 47, after the first micro laser displacement sensor 41 detects the original point with the distance X1, at the current rotation speed, the time t when the original point reaches the second laser displacement sensor 42 is predicted and recorded, and t is transmitted to the area controller 46, which represents the time interval after t, the original point will reach the second micro laser displacement sensor 42, which is equivalent to giving a leading signal to the second micro laser displacement sensor 42, and the detection is ready.

The adjusting device further comprises a rotating speed detection sensor 48 arranged on the impeller 2, when the fan normally operates for a certain time, such as 20s, the rotating speed detection sensor 48 starts to work, the rotating speed detection sensor 48 of the impeller 2 is indirectly and wirelessly connected with the zone controller 46, and the rotating speed detection sensor 48 acquires the current rotating speed of the impeller 2 and wirelessly transmits the rotating speed to the zone controller 46.

The regulating device further comprises a drive controller 49 arranged on the outer side wall of the volute 1 for controlling the two micro laser displacement sensors.

Referring to fig. 5, the air pressure detection sensor 45, the rotation speed detection sensor 48, the inflation control unit 43 and the driving controller 49 of the adjustment device are electrically connected to the zone controller 46, and the first micro laser displacement sensor 41 and the second micro laser displacement sensor 42 are electrically connected to the driving controller 49. The inflation control unit 43 controls an inflation canister 44, which is wirelessly connected to a zone controller 46. The zone controller 46 is also electrically connected to a timer 47.

The control method of the fan system, referring to fig. 6, includes the following steps:

1) starting a fan system;

2) after the fan system is started for a certain time, for example, 30s, the driving controller 49 controls the first micro laser displacement sensor 41 to start detection, so as to obtain a current operation displacement value d1 of the blade 21, that is, the thickness of the blade 21, and transmit the current operation displacement value d1 to the area controller 46; the air pressure detection sensor 45 synchronously starts a detection air pressure value after the fan system is started to obtain an air pressure value P1 of a current corresponding position, and transmits the air pressure value P1 to the zone controller 46; after the fan system is started for a certain time, for example, 20s, the rotation speed detection sensor 48 starts to detect the rotation speed, so as to obtain a rotation speed value R1 of the current operation of the impeller 2, and transmit the rotation speed value R1 to the zone controller 46;

3) the zone controller 46 determines whether the received d1 is equal to the preset X1, if yes, go to step 4), if no, go back to step 2) to re-detect the current operation displacement value d 1;

4) the zone controller 46 marks the detected blade 21 as an origin point, and starts a timer 47;

5) the zone controller 46 calls the current rotation speed value R1 and the air pressure value P1;

6) the zone controller 46 determines whether R1 is greater than a preset maximum rotation speed, such as 1200Rad/min, and P1 is greater than a preset maximum pressure, such as 135Pa, if yes, detects whether the air outlet duct is abnormal, and the motor 3 is overloaded, if no, goes to step 7);

7) the zone controller 46 obtains the time t when the original point reaches the second micro laser displacement sensor 42 at the current rotating speed; the region-sharing controller 46 gives the amount of gas to be charged Q1 according to the current rotating speed value R1 and the air pressure value P1, and transmits the amount of gas to be charged Q1 to the gas charging control unit 43; the relationship between the rotation speed value R1, the air pressure value P1 and the to-be-inflated air quantity Q1 can be obtained in advance through a large number of experiments and is stored in the region controller 46;

8) the area controller 46 transmits the value t to the driving controller 49, and the driving controller 49 controls the second micro laser displacement sensor 42 to start detection after time t to obtain a current displacement value d2 when the original point rotates to a position corresponding to the second micro laser displacement sensor 42; in the rotation process of the impeller 2, starting from an original point marked by the area controller 46, sequentially charging the blades 21 with the to-be-charged air quantity Q1 by the charging tank 44 along the rotation direction of the impeller 2;

9) the zone controller 46 determines whether the received d2 is equal to the preset X2, if yes, go to step 10), if no, go back to step 7);

10) completing inflation; return to step 2).

By the method, when the unstable air volume caused by the use environment, the flue circulation condition and the airflow change of the fan system can be compensated in real time, on one hand, the airflow state in the fan system tends to be stable, and the effective air volume is ensured; on the other hand, the structural rigidity of the impeller is adjusted in real time, so that abnormal sound is improved.

Claims

1. A fan system comprising a volute (1), an impeller (2) disposed within the volute (1), and a motor (3) for driving the impeller (2), the volute (1) being formed with a volute tongue (12), characterized in that: the fan system comprises a volute (1), and is characterized in that a fixing area (13) is defined by an interval of 0 degrees to 60 degrees where a volute tongue (12) is located along the direction from the starting point to the end point of the molded line of the volute, the impeller (2) comprises at least two blades (21) which are circumferentially arranged at intervals, each blade (21) comprises a blade body (211) and an elastic material layer (212) covering the periphery of the blade body (211), the fan system further comprises an adjusting device, and the adjusting device comprises an inflation tank (44) communicated with the inside of the elastic material layer (212) and an inflation control unit (43) used for controlling the inflation tank (44) to inflate the blades (21) passing through the fixing area (13).

2. The fan system of claim 1, wherein: the regulating device further comprises a first micro laser displacement sensor (41) arranged at the start of the fixed area (13) inside the volute (1), and a second micro laser displacement sensor (42) arranged at the stop of the fixed area (13) inside the volute (1).

3. The fan system of claim 2, wherein: the adjusting device also comprises a driving controller (49) which is arranged on the outer side wall of the volute (1) and is used for controlling the first micro laser displacement sensor (41) and the second micro laser displacement sensor (42).

4. The fan system of claim 3, wherein: the volute (1) is also provided with an air outlet (14), and the adjusting device further comprises an air pressure detection sensor (45) arranged at the air outlet (14) in the volute (1) and a rotating speed detection sensor (48) arranged on the impeller (2).

5. The fan system of claim 4, wherein: the adjusting device further comprises a zone controller (46) arranged in the volute (1) and a timer (47) electrically connected with the zone controller (46), the air pressure detection sensor (45), the rotating speed detection sensor (48), the inflation control unit (43) and the drive controller (49) are electrically connected with the zone controller (46), the first micro laser displacement sensor (41) and the second micro laser displacement sensor (42) are electrically connected with the drive controller (49), and the inflation control unit (43) is wirelessly connected with the zone controller (46).

6. A method of controlling a fan system according to claim 5, comprising the steps of:

1) starting a fan system;

2) after the fan system is started for a certain time, the driving controller (49) controls the first micro laser displacement sensor (41) to start detection, obtains a current operation displacement value d1 of the blade (21), and transmits the current operation displacement value d1 to the area controller (46); the air pressure detection sensor (45) synchronously starts a detection air pressure value after the fan system is started to obtain an air pressure value P1 of a current corresponding position, and transmits the air pressure value P1 to the zone controller (46); after the fan system is started for a certain time, the rotating speed detection sensor (48) starts to detect the rotating speed, so that a rotating speed value R1 of the current operation of the impeller (2) is obtained and is transmitted to the zone controller (46);

3) the zone controller (46) judges whether the received d1 is equal to a preset X1, if so, the step 4) is carried out, and if not, the step 2) is carried out again to detect the current operation displacement value d 1;

4) the zone controller (46) marks the detected blade (21) as an origin and starts a timer (47);

5) the zone controller (46) calls a current rotating speed value R1 and an air pressure value P1;

6) the zone controller (46) judges whether R1 is greater than a preset highest rotating speed or not and whether P1 is greater than a preset maximum pressure or not, if yes, whether an air outlet pipeline is abnormal or not and whether the motor (3) is overloaded or not are detected, and if not, the step 7 is executed;

7) the region controller (46) obtains the time t when the original point reaches the second micro laser displacement sensor (42) at the current rotating speed; meanwhile, the regional controller (46) gives out the amount Q1 to be inflated according to the current rotating speed value R1 and the air pressure value P1 and transmits the amount Q1 to the inflation control unit (43);

8) the area controller (46) transmits the value t to the driving controller (49), and the driving controller (49) controls the second micro laser displacement sensor (42) to start detection after t to obtain a current displacement value d2 when the original point rotates to a corresponding detection position; meanwhile, in the rotation process of the impeller (2), starting from an original point marked by the area controller (46), sequentially charging the blades (21) with the to-be-charged air quantity Q1 by the charging tank (44) along the rotation direction of the impeller (2);

9) the zone controller (46) determines whether the received d2 is equal to a preset X2, if so, proceeds to step 10), and if not, returns to step 7);

10) completing inflation; return to step 2).

7. A range hood, its characterized in that: use of a fan system according to any of claims 1-5.